CVE-2026-18918: Eclipse Foundation Eclipse Lyo

Critical severity, CVSS 9.1. EPSS: 0.4% chance of exploitation in the next 30 days.

In Eclipse Lyo versions 2.0.0 to 7.0.0, OAuth server authorization checks can be bypassed when the 2-legged auth is supported by the server. In those cases, application that based their authz filters upon Lyo-provided `AbstractAdapterCredentialsFilter`, are vulnerable. An attacked can create a provisional trusted client (valid use-case) but then it can be used as a trusted client immediately without requiring the administrator approval to clear the provisional status. The 3-legged path requiring user interaction is not vulnerable and rejects provisional clients.

Affected products

Published 2026-08-28. Last modified 2026-09-01.